raster: implement glPixelZoom

src/functions.c

@@ -241,7 +241,7 @@ static const ProcMap s_proc_map[] = {
     PROC(glPixelStorei),
     //PROC(glPixelTransferf),
     //PROC(glPixelTransferi),
-    //PROC(glPixelZoom),
+    PROC(glPixelZoom),
     PROC(glPointSize),
     PROC(glPolygonMode),
     PROC(glPolygonOffset),

src/gc_gl.c

@@ -283,6 +283,8 @@ void ogx_initialize()
     glparamstate.raster_pos[2] = 0.0f;
     glparamstate.raster_pos[3] = 1.0f;
     glparamstate.raster_pos_valid = true;
+    glparamstate.pixel_zoom_x = 1.0f;
+    glparamstate.pixel_zoom_y = 1.0f;
 
     glparamstate.depth_near = 0.0f;
     glparamstate.depth_far = 1.0f;

src/getters.c

@@ -296,6 +296,12 @@ void glGetIntegerv(GLenum pname, GLint *params)
     case GL_RENDER_MODE:
         *params = glparamstate.render_mode;
         return;
+    case GL_ZOOM_X:
+        *params = glparamstate.pixel_zoom_x;
+        break;
+    case GL_ZOOM_Y:
+        *params = glparamstate.pixel_zoom_y;
+        break;
     default:
         return;
     };

src/raster.cpp

@@ -39,6 +39,12 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <malloc.h>
 #include <type_traits>
 
+void glPixelZoom(GLfloat xfactor, GLfloat yfactor)
+{
+    glparamstate.pixel_zoom_x = xfactor;
+    glparamstate.pixel_zoom_y = yfactor;
+}
+
 static void set_current_raster_pos(const guVector *pos)
 {
     guVector pos_mv;
@@ -226,22 +232,22 @@ static void draw_raster_texture(GXTexObj *texture, int width, int height,
 
     int y0, y1;
     if (height < 0) {
-        y0 = screen_y + height;
+        y0 = screen_y + height * glparamstate.pixel_zoom_y;
         y1 = screen_y;
     } else {
         /* The first row we read from the bitmap is the bottom row, so let's take
          * this into account and flip the image vertically */
         y0 = screen_y;
-        y1 = screen_y - height;
+        y1 = screen_y - height * glparamstate.pixel_zoom_y;
     }
     GX_Begin(GX_QUADS, GX_VTXFMT0, 4);
     GX_Position3f32(screen_x, y0, screen_z);
     GX_TexCoord2u8(0, 0);
     GX_Position3f32(screen_x, y1, screen_z);
     GX_TexCoord2u8(0, 1);
-    GX_Position3f32(screen_x + width, y1, screen_z);
+    GX_Position3f32(screen_x + width * glparamstate.pixel_zoom_x, y1, screen_z);
     GX_TexCoord2u8(1, 1);
-    GX_Position3f32(screen_x + width, y0, screen_z);
+    GX_Position3f32(screen_x + width * glparamstate.pixel_zoom_x, y0, screen_z);
     GX_TexCoord2u8(1, 0);
     GX_End();
 }

src/state.h

@@ -99,6 +99,8 @@ typedef struct glparams_
     float texture_object_plane_s[4];
     float texture_object_plane_t[4];
     float raster_pos[4];
+    float pixel_zoom_x;
+    float pixel_zoom_y;
     float depth_near;
     float depth_far;
     int cur_modv_mat, cur_proj_mat;